Proposers' and responders' behavior.

(A) Proposers' offers. The equality and equity norms are shown in blue (horizontal) and red (oblique), respectively. (B) Deviation between proposers' offers and the equality norm (i.e., difference between a given offer and 50% of the pie) in the low and high contribution conditions. Each line corresponds to one individual and each value is the average of three trials. (C) Deviation between proposers' offers and the equity norm (i.e., difference between the percentage of the pie offered and the percentage produced) in the low and high contribution conditions. (D) Frequency of responders' acceptance decisions. (E) Fairness ratings (Z scores) on a 7-point Likert scale. (F) Satisfaction ratings (Z scores), extracted from the Geneva Emotion Wheel, including only five levels. Letters above the bars in Panels D to F indicate conditions that do not differ significantly from one another. Letters in gray italics indicate marginal effects. Asterics indicate significant differences between low and high contribution conditions.